For those getting the Flashback badges, here's the "easy" arc list for Hero-side. About half of these were recommended to me by a friend on Virtue. Below the arcs is a recommended approach to getting all the badges associated with the arcs. Here's the list for now:

01-14: Officer Wincott vs. the Trolls (HINT: The time/defeat badges are easy for this one, too.)

15-19: I Lost My Daddy (HINT: If you just want the Flashback badges quick, fail the first mission.)